Siphon roof drain applied to viaduct

The utility model provides a siphon roof drain applied to a viaduct, which is arranged on a drain pipe of the viaduct and comprises a top cover, an anti-vortex component and a water collecting tray, the upper end face of the top cover is flush with the road surface of the viaduct, and a plurality of water outlets are formed in the top cover. One end of the anti-vortex assembly is connected with the lower end face of the top cover, the other end of the anti-vortex assembly is arranged on the water collecting disc, and a water collecting opening is formed in the water collecting disc and communicated with the water drainage pipe in a sealed mode. The siphon roof drain has the advantages that the top cover of the siphon roof drain is arranged to be flush with the road surface, the water collecting requirement is met, the vehicle-mounted requirement and the driving safety requirement are met, and the driving experience of a driver is not affected. Compared with a conventional drainage well lid, the siphon roof dr